Understanding the Effect of Electrical Load on Generator Resistance

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Discussion Overview

The discussion centers around the relationship between electrical load and generator resistance, particularly in the context of power generation plants. Participants explore how increasing electrical load affects generator performance, including current, voltage, and resistance, while considering different configurations of electrical loads.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions whether increasing electrical load on a generator leads to an increase or decrease in resistance, noting that current remains constant.
  • Another participant explains that increasing load typically causes the generator's speed to drop, which is compensated by the governor adjusting fuel input to maintain power output.
  • A participant seeks clarification on whether the increase in load means electrical resistances are added in series or parallel.
  • Some participants argue that the configuration of resistances (series or parallel) does not directly relate to the load seen by the generator, as most systems have a combination of both.
  • There is confusion regarding the implications of increased load and how it affects resistance, with one participant suggesting it may relate to the relationship defined by Ohm's law (V=IR).
  • Another participant notes that increasing load implies increased power demand, which generally leads to increased current for a fixed voltage, affecting generator speed and voltage output.
  • It is mentioned that if additional load is placed in parallel, the overall resistance drops, and that in AC systems, both resistive and reactive loads must be considered.

Areas of Agreement / Disagreement

Participants express differing views on the relationship between load, resistance, and generator performance. There is no consensus on how to interpret the effects of load on resistance or the implications of series versus parallel configurations.

Contextual Notes

Participants have not fully resolved the assumptions regarding the relationship between load configurations and generator performance, and there are unresolved questions about the definitions and implications of electrical load in this context.

banerjeerupak
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You see i came across this question during my viva in my practical examination. Well the question was that when we increase the electrical load on a genarator, does the resistance in the load increase or go down for the load to increase. we notice that the current remains constant...
 
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On a typical arrangement, when you increase load, the speed drops. This is sensed by the generator's governor; fueling is increased, the speed rises again, and an increased power output is seen.

I don't understand the way you've phrased the question though; if you apply electrical load to the generator output, you apply mechanical load to the prime mover.

Could you clarify?
 
what i need to know is that there is a power generation plant. there the load is seen to increase. does this mean that the electrical resistances which consume power are being added up in series or in parallel.
 
Series or parallel? That doesn't have anything to do with what load the generator sees. Pretty much every house/building has a combination of both.

I'm really not sure what you are asking...
 
no but which happens when the load is increased...both?
 
Which what? What you are asking really makes no sense.

If you flip on a light, regardless of how it is wired, that extra energy being drained from the power grid causes the speed of a generator to slow as brewnog explained.
 
I may have interpreted this wrong, but it could possibly be about increasing voltage whilst having the current remain the same and observing the effect on the resistance, ie V=IR
 
The speed of the generator determines the voltage.

Increasing load implies increasing the power demand, which means increasing current for a fixed voltage. An increased current would also increase opposing torque on the generator, which slows it down, which lowers the voltage.

If additional load is placed in parallel, then the resistance drops.

On an AC system, one needs to consider resistive and reactive loads.
 
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